http://www.cfda.gov/ The Catalog of Federal Domestic Assistance (CFDA) is a government-wide compendium
of Federal programs, projects, services, and activities which provide assistance or
benefits to the American public. It contains financial and non-financial assistance
programs administered by departments and establishments of the Federal government.

Commerce Business Daily

http://cbdnet.access.gpo.gov/ The official online listing of Government contracting opportunities. Follow the provided
guides to searching this very important database.